2017 Blacktown state by-election
14 October 2017
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A by-election was held in the state electoral district of Blacktown on 14 October 2017. The by-election was triggered by the resignation of John Robertson (Labor). Robertson served as state Leader of the Opposition from 2011 until 2014.
The by-election was held on the same day as by-elections Cootamundra and Murray.